#define __SP_DESKTOP_SNAP_C__

#include <utility>

#include "sp-namedview.h"

#include "snap.h"

#include "snapped-line.h"

#include "snapped-curve.h"

#include <libnr/nr-point-fns.h>

#include <libnr/nr-scale-ops.h>

#include <libnr/nr-values.h>

#include "display/canvas-grid.h"

#include "display/snap-indicator.h"

#include "inkscape.h"

#include "desktop.h"

#include "sp-guide.h"

#include "preferences.h"

using std::vector;

SnapManager::SnapManager(SPNamedView const *v) :

guide(this, 0),

object(this, 0),

snapprefs(),

_named_view(v)

{

}

SnapManager::SnapperList

SnapManager::getSnappers() const

{

SnapManager::SnapperList s;

s.push_back(&guide);

s.push_back(&object);

SnapManager::SnapperList gs = getGridSnappers();

s.splice(s.begin(), gs);

return s;

}

SnapManager::SnapperList

SnapManager::getGridSnappers() const

{

SnapperList s;

//FIXME: this code should actually do this: add new grid snappers that are active for this desktop. now it just adds all gridsnappers

if (_desktop && _desktop->gridsEnabled() && snapprefs.getSnapToGrids()) {

for ( GSList const *l = _named_view->grids; l != NULL; l = l->next) {

Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;

s.push_back(grid->snapper);

}

}

return s;

}

bool SnapManager::someSnapperMightSnap() const

{

if ( !snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() ) {

return false;

}

SnapperList const s = getSnappers();

SnapperList::const_iterator i = s.begin();

while (i != s.end() && (*i)->ThisSnapperMightSnap() == false) {

i++;

}

return (i != s.end());

}

bool SnapManager::gridSnapperMightSnap() const

{

if ( !snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() ) {

return false;

}

SnapperList const s = getGridSnappers();

SnapperList::const_iterator i = s.begin();

while (i != s.end() && (*i)->ThisSnapperMightSnap() == false) {

i++;

}

return (i != s.end());

}

void SnapManager::freeSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,

Geom::Point &p,

Inkscape::SnapSourceType const source_type,

bool first_point,

Geom::OptRect const &bbox_to_snap) const

{

Inkscape::SnappedPoint const s = freeSnap(point_type, p, source_type, first_point, bbox_to_snap);

s.getPoint(p);

}

Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::SnapPreferences::PointType point_type,

Geom::Point const &p,

Inkscape::SnapSourceType const &source_type,

bool first_point,

Geom::OptRect const &bbox_to_snap) const

{

if (_desktop->canvas->context_snap_delay_active == false) {

g_warning("context_snap_delay_active has not been set to true by the current context. Please report this!");

// When the context goes into dragging-mode, then Inkscape should call this: sp_canvas_set_snap_delay_active(desktop->canvas, true);

}

if (!someSnapperMightSnap()) {

return Inkscape::SnappedPoint(p, source_type, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false);

}

std::vector<SPItem const *> *items_to_ignore;

if (_item_to_ignore) { // If we have only a single item to ignore

// then build a list containing this single item;

// This single-item list will prevail over any other _items_to_ignore list, should that exist

items_to_ignore = new std::vector<SPItem const *>;

items_to_ignore->push_back(_item_to_ignore);

} else {

items_to_ignore = _items_to_ignore;

}

SnappedConstraints sc;

SnapperList const snappers = getSnappers();

for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {

(*i)->freeSnap(sc, point_type, p, source_type, first_point, bbox_to_snap, items_to_ignore, _unselected_nodes);

}

if (_item_to_ignore) {

delete items_to_ignore;

}

return findBestSnap(p, source_type, sc, false);

}

Geom::Point SnapManager::multipleOfGridPitch(Geom::Point const &t) const

{

if (!snapprefs.getSnapEnabledGlobally()) // No need to check for snapprefs.getSnapPostponedGlobally() here

return t;

//FIXME: this code should actually do this: add new grid snappers that are active for this desktop. now it just adds all gridsnappers

if (_desktop && _desktop->gridsEnabled()) {

bool success = false;

Geom::Point nearest_multiple;

Geom::Coord nearest_distance = NR_HUGE;

// It will snap to the grid for which we find the closest snap. This might be a different

// grid than to which the objects were initially aligned. I don't see an easy way to fix

// this, so when using multiple grids one can get unexpected results

// Cannot use getGridSnappers() because we need both the grids AND their snappers

// Therefore we iterate through all grids manually

for (GSList const *l = _named_view->grids; l != NULL; l = l->next) {

Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;

const Inkscape::Snapper* snapper = grid->snapper;

if (snapper && snapper->ThisSnapperMightSnap()) {

// To find the nearest multiple of the grid pitch for a given translation t, we

// will use the grid snapper. Simply snapping the value t to the grid will do, but

// only if the origin of the grid is at (0,0). If it's not then compensate for this

// in the translation t

Geom::Point const t_offset = t + grid->origin;

SnappedConstraints sc;

// Only the first three parameters are being used for grid snappers

snapper->freeSnap(sc, Inkscape::SnapPreferences::SNAPPOINT_NODE, t_offset, Inkscape::SNAPSOURCE_UNDEFINED, TRUE, Geom::OptRect(), NULL, NULL);

// Find the best snap for this grid, including intersections of the grid-lines

Inkscape::SnappedPoint s = findBestSnap(t_offset, Inkscape::SNAPSOURCE_UNDEFINED, sc, false);

if (s.getSnapped() && (s.getSnapDistance() < nearest_distance)) {

// use getSnapDistance() instead of getWeightedDistance() here because the pointer's position

// doesn't tell us anything about which node to snap

success = true;

nearest_multiple = s.getPoint() - to_2geom(grid->origin);

nearest_distance = s.getSnapDistance();

}

}

}

if (success)

return nearest_multiple;

}

return t;

}

void SnapManager::constrainedSnapReturnByRef(Inkscape::SnapPreferences::PointType point_type,

Geom::Point &p,

Inkscape::SnapSourceType const source_type,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point,

Geom::OptRect const &bbox_to_snap) const

{

Inkscape::SnappedPoint const s = constrainedSnap(point_type, p, source_type, constraint, first_point, bbox_to_snap);

s.getPoint(p);

}

Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::SnapPreferences::PointType point_type,

Geom::Point const &p,

Inkscape::SnapSourceType const &source_type,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point,

Geom::OptRect const &bbox_to_snap) const

{

if (_desktop->canvas->context_snap_delay_active == false) {

g_warning("context_snap_delay_active has not been set to true by the current context. Please report this!");

// When the context goes into dragging-mode, then Inkscape should call this: sp_canvas_set_snap_delay_active(desktop->canvas, true);

}

if (!someSnapperMightSnap()) {

return Inkscape::SnappedPoint(p, source_type, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false);

}

std::vector<SPItem const *> *items_to_ignore;

if (_item_to_ignore) { // If we have only a single item to ignore

// then build a list containing this single item;

// This single-item list will prevail over any other _items_to_ignore list, should that exist

items_to_ignore = new std::vector<SPItem const *>;

items_to_ignore->push_back(_item_to_ignore);

} else {

items_to_ignore = _items_to_ignore;

}

SnappedConstraints sc;

SnapperList const snappers = getSnappers();

for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {

(*i)->constrainedSnap(sc, point_type, p, source_type, first_point, bbox_to_snap, constraint, items_to_ignore);

}

if (_item_to_ignore) {

delete items_to_ignore;

}

return findBestSnap(p, source_type, sc, true);

}

void SnapManager::guideSnap(Geom::Point &p, Geom::Point const &guide_normal) const

{

// This method is used to snap a guide to nodes or to other guides, while dragging the guide around. Will not snap to grids!

if (_desktop->canvas->context_snap_delay_active == false) {

g_warning("context_snap_delay_active has not been set to true by the current context. Please report this!");

// When the context goes into dragging-mode, then Inkscape should call this: sp_canvas_set_snap_delay_active(desktop->canvas, true);

}

if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally()) {

return;

}

if (!(object.GuidesMightSnap() || snapprefs.getSnapToGuides())) {

return;

}

// Snap to nodes

SnappedConstraints sc;

if (object.GuidesMightSnap()) {

object.guideSnap(sc, p, guide_normal);

}

// Snap to guides

if (snapprefs.getSnapToGuides()) {

guide.freeSnap(sc, Inkscape::SnapPreferences::SNAPPOINT_GUIDE, p, Inkscape::SNAPSOURCE_GUIDE, true, Geom::OptRect(), NULL, NULL);

}

// We won't snap to grids, what's the use?

Inkscape::SnappedPoint const s = findBestSnap(p, Inkscape::SNAPSOURCE_GUIDE, sc, false);

s.getPoint(p);

}

Inkscape::SnappedPoint SnapManager::_snapTransformed(

Inkscape::SnapPreferences::PointType type,

std::vector<std::pair<Geom::Point, int> > const &points,

Geom::Point const &pointer,

bool constrained,

Inkscape::Snapper::ConstraintLine const &constraint,

Transformation transformation_type,

Geom::Point const &transformation,

Geom::Point const &origin,

Geom::Dim2 dim,

bool uniform) const

{

/* We have a list of points, which we are proposing to transform in some way. We need to see

/* Quick check to see if we have any snappers that are enabled

if (someSnapperMightSnap() == false) {

return Inkscape::SnappedPoint();

}

std::vector<std::pair<Geom::Point, int> > transformed_points;

Geom::Rect bbox;

for (std::vector<std::pair<Geom::Point, int> >::const_iterator i = points.begin(); i != points.end(); i++) {

/* Work out the transformed version of this point */

Geom::Point transformed = _transformPoint(*i, transformation_type, transformation, origin, dim, uniform);

// add the current transformed point to the box hulling all transformed points

if (i == points.begin()) {

bbox = Geom::Rect(transformed, transformed);

} else {

bbox.expandTo(transformed);

}

transformed_points.push_back(std::make_pair(transformed, (*i).second));

}

/* The current best transformation */

Geom::Point best_transformation = transformation;

/* The current best metric for the best transformation; lower is better, NR_HUGE

Geom::Point best_scale_metric(NR_HUGE, NR_HUGE);

Inkscape::SnappedPoint best_snapped_point;

g_assert(best_snapped_point.getAlwaysSnap() == false); // Check initialization of snapped point

g_assert(best_snapped_point.getAtIntersection() == false);

std::vector<std::pair<Geom::Point, int> >::const_iterator j = transformed_points.begin();

// std::cout << std::endl;

for (std::vector<std::pair<Geom::Point, int> >::const_iterator i = points.begin(); i != points.end(); i++) {

/* Snap it */

Inkscape::SnappedPoint snapped_point;

Inkscape::Snapper::ConstraintLine dedicated_constraint = constraint;

Geom::Point const b = ((*i).first - origin); // vector to original point

if (constrained) {

if ((transformation_type == SCALE || transformation_type == STRETCH) && uniform) {

// When uniformly scaling, each point will have its own unique constraint line,

// running from the scaling origin to the original untransformed point. We will

// calculate that line here

dedicated_constraint = Inkscape::Snapper::ConstraintLine(origin, b);

} else if (transformation_type == STRETCH) { // when non-uniform stretching {

dedicated_constraint = Inkscape::Snapper::ConstraintLine((*i).first, component_vectors[dim]);

} else if (transformation_type == TRANSLATION) {

// When doing a constrained translation, all points will move in the same direction, i.e.

// either horizontally or vertically. The lines along which they move are therefore all

// parallel, but might not be colinear. Therefore we will have to set the point through

// which the constraint-line runs here, for each point individually.

dedicated_constraint.setPoint((*i).first);

} // else: leave the original constraint, e.g. for skewing

if (transformation_type == SCALE && !uniform) {

g_warning("Non-uniform constrained scaling is not supported!");

}

snapped_point = constrainedSnap(type, (*j).first, static_cast<Inkscape::SnapSourceType>((*j).second), dedicated_constraint, i == points.begin(), bbox);

} else {

bool const c1 = fabs(b[Geom::X]) < 1e-6;

bool const c2 = fabs(b[Geom::Y]) < 1e-6;

if (transformation_type == SCALE && (c1 || c2) && !(c1 && c2)) {

// When scaling, a point aligned either horizontally or vertically with the origin can only

// move in that specific direction; therefore it should only snap in that direction, otherwise

// we will get snapped points with an invalid transformation

dedicated_constraint = Inkscape::Snapper::ConstraintLine(origin, component_vectors[c1]);

snapped_point = constrainedSnap(type, (*j).first, static_cast<Inkscape::SnapSourceType>((*j).second), dedicated_constraint, i == points.begin(), bbox);

} else {

snapped_point = freeSnap(type, (*j).first, static_cast<Inkscape::SnapSourceType>((*j).second), i == points.begin(), bbox);

}

}

// std::cout << "dist = " << snapped_point.getSnapDistance() << std::endl;

snapped_point.setPointerDistance(Geom::L2(pointer - (*i).first));

Geom::Point result;

Geom::Point scale_metric(NR_HUGE, NR_HUGE);

if (snapped_point.getSnapped()) {

/* We snapped. Find the transformation that describes where the snapped point has

Geom::Point const a = (snapped_point.getPoint() - origin); // vector to snapped point

//Geom::Point const b = (*i - origin); // vector to original point

switch (transformation_type) {

case TRANSLATION:

result = snapped_point.getPoint() - (*i).first;

/* Consider the case in which a box is almost aligned with a grid in both

// Only for translations, the relevant metric will be the real snapped distance,

// so we don't have to do anything special here

break;

case SCALE:

{

result = Geom::Point(NR_HUGE, NR_HUGE);

// If this point *i is horizontally or vertically aligned with

// the origin of the scaling, then it will scale purely in X or Y

// We can therefore only calculate the scaling in this direction

// and the scaling factor for the other direction should remain

// untouched (unless scaling is uniform ofcourse)

for (int index = 0; index < 2; index++) {

if (fabs(b[index]) > 1e-6) { // if SCALING CAN occur in this direction

if (fabs(fabs(a[index]/b[index]) - fabs(transformation[index])) > 1e-12) { // if SNAPPING DID occur in this direction

result[index] = a[index] / b[index]; // then calculate it!

}

// we might leave result[1-index] = NR_HUGE

// if scaling didn't occur in the other direction

}

}

// Compare the resulting scaling with the desired scaling

scale_metric = result - transformation; // One or both of its components might be NR_HUGE

break;

}

case STRETCH:

result = Geom::Point(NR_HUGE, NR_HUGE);

if (fabs(b[dim]) > 1e-6) { // if STRETCHING will occur for this point

result[dim] = a[dim] / b[dim];

result[1-dim] = uniform ? result[dim] : 1;

} else { // STRETCHING might occur for this point, but only when the stretching is uniform

if (uniform && fabs(b[1-dim]) > 1e-6) {

result[1-dim] = a[1-dim] / b[1-dim];

result[dim] = result[1-dim];

}

}

// Store the metric for this transformation as a virtual distance

snapped_point.setSnapDistance(std::abs(result[dim] - transformation[dim]));

snapped_point.setSecondSnapDistance(NR_HUGE);

break;

case SKEW:

result[0] = (snapped_point.getPoint()[dim] - ((*i).first)[dim]) / (((*i).first)[1 - dim] - origin[1 - dim]); // skew factor

result[1] = transformation[1]; // scale factor

// Store the metric for this transformation as a virtual distance

snapped_point.setSnapDistance(std::abs(result[0] - transformation[0]));

snapped_point.setSecondSnapDistance(NR_HUGE);

break;

default:

g_assert_not_reached();

}

// When scaling, we're considering the best transformation in each direction separately. We will have a metric in each

// direction, whereas for all other transformation we only a single one-dimensional metric. That's why we need to handle

// the scaling metric differently

if (transformation_type == SCALE) {

for (int index = 0; index < 2; index++) {

if (fabs(scale_metric[index]) < fabs(best_scale_metric[index])) {

best_transformation[index] = result[index];

best_scale_metric[index] = fabs(scale_metric[index]);

// When scaling, we're considering the best transformation in each direction separately

// Therefore two different snapped points might together make a single best transformation

// We will however return only a single snapped point (e.g. to display the snapping indicator)

best_snapped_point = snapped_point;

// std::cout << "SEL ";

} // else { std::cout << " ";}

}

if (uniform) {

if (best_scale_metric[0] < best_scale_metric[1]) {

best_transformation[1] = best_transformation[0];

best_scale_metric[1] = best_scale_metric[0];

} else {

best_transformation[0] = best_transformation[1];

best_scale_metric[0] = best_scale_metric[1];

}

}

} else { // For all transformations other than scaling

if (best_snapped_point.isOtherSnapBetter(snapped_point, true)) {

best_transformation = result;

best_snapped_point = snapped_point;

}

}

}

j++;

}

Geom::Coord best_metric;

if (transformation_type == SCALE) {

// When scaling, don't ever exit with one of scaling components set to NR_HUGE

for (int index = 0; index < 2; index++) {

if (best_transformation[index] == NR_HUGE) {

if (uniform && best_transformation[1-index] < NR_HUGE) {

best_transformation[index] = best_transformation[1-index];

} else {

best_transformation[index] = transformation[index];

}

}

}

best_metric = std::min(best_scale_metric[0], best_scale_metric[1]);

} else { // For all transformations other than scaling

best_metric = best_snapped_point.getSnapDistance();

}

best_snapped_point.setTransformation(best_transformation);

// Using " < 1e6" instead of " < NR_HUGE" for catching some rounding errors

// These rounding errors might be caused by NRRects, see bug #1584301

best_snapped_point.setSnapDistance(best_metric < 1e6 ? best_metric : NR_HUGE);

return best_snapped_point;

}

Inkscape::SnappedPoint SnapManager::freeSnapTranslation(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Point const &tr) const

{

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), TRANSLATION, tr, Geom::Point(0,0), Geom::X, false), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, false, Geom::Point(0,0), TRANSLATION, tr, Geom::Point(0,0), Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapTranslation(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &tr) const

{

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), TRANSLATION, tr, Geom::Point(0,0), Geom::X, false), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, true, constraint, TRANSLATION, tr, Geom::Point(0,0), Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::freeSnapScale(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Scale const &s,

Geom::Point const &o) const

{

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, false), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, false, Geom::Point(0,0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapScale(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Scale const &s,

Geom::Point const &o) const

{

// When constrained scaling, only uniform scaling is supported.

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, true), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, true, Geom::Point(0,0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, true);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapStretch(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Geom::Coord const &s,

Geom::Point const &o,

Geom::Dim2 d,

bool u) const

{

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), STRETCH, Geom::Point(s, s), o, d, u), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, true, Geom::Point(0,0), STRETCH, Geom::Point(s, s), o, d, u);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapSkew(Inkscape::SnapPreferences::PointType point_type,

std::vector<std::pair<Geom::Point, int> > const &p,

Geom::Point const &pointer,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &s,

Geom::Point const &o,

Geom::Dim2 d) const

{

// "s" contains skew factor in s[0], and scale factor in s[1]

// Snapping the nodes of the boundingbox of a selection that is being transformed, will only work if

// the transformation of the bounding box is equal to the transformation of the individual nodes. This is

// NOT the case for example when rotating or skewing. The bounding box itself cannot possibly rotate or skew,

// so it's corners have a different transformation. The snappers cannot handle this, therefore snapping

// of bounding boxes is not allowed here.

g_assert(!(point_type & Inkscape::SnapPreferences::SNAPPOINT_BBOX));

if (p.size() == 1) {

_displaySnapsource(point_type, std::make_pair(_transformPoint(p.at(0), SKEW, s, o, d, false), (p.at(0)).second));

}

return _snapTransformed(point_type, p, pointer, true, constraint, SKEW, s, o, d, false);

}

Inkscape::SnappedPoint SnapManager::findBestSnap(Geom::Point const &p, Inkscape::SnapSourceType const source_type, SnappedConstraints &sc, bool constrained) const

{

/*

// Store all snappoints

std::list<Inkscape::SnappedPoint> sp_list;

// search for the closest snapped point

Inkscape::SnappedPoint closestPoint;

if (getClosestSP(sc.points, closestPoint)) {

sp_list.push_back(closestPoint);

}

// search for the closest snapped curve

Inkscape::SnappedCurve closestCurve;

if (getClosestCurve(sc.curves, closestCurve)) {

sp_list.push_back(Inkscape::SnappedPoint(closestCurve));

}

if (snapprefs.getSnapIntersectionCS()) {

// search for the closest snapped intersection of curves

Inkscape::SnappedPoint closestCurvesIntersection;

if (getClosestIntersectionCS(sc.curves, p, closestCurvesIntersection, _desktop->dt2doc())) {

closestCurvesIntersection.setSource(source_type);

sp_list.push_back(closestCurvesIntersection);

}

}

// search for the closest snapped grid line

Inkscape::SnappedLine closestGridLine;

if (getClosestSL(sc.grid_lines, closestGridLine)) {

sp_list.push_back(Inkscape::SnappedPoint(closestGridLine));

}

// search for the closest snapped guide line

Inkscape::SnappedLine closestGuideLine;

if (getClosestSL(sc.guide_lines, closestGuideLine)) {

sp_list.push_back(Inkscape::SnappedPoint(closestGuideLine));

}

// When freely snapping to a grid/guide/path, only one degree of freedom is eliminated

// Therefore we will try get fully constrained by finding an intersection with another grid/guide/path

// When doing a constrained snap however, we're already at an intersection of the constrained line and

// the grid/guide/path we're snapping to. This snappoint is therefore fully constrained, so there's

// no need to look for additional intersections

if (!constrained) {

// search for the closest snapped intersection of grid lines

Inkscape::SnappedPoint closestGridPoint;

if (getClosestIntersectionSL(sc.grid_lines, closestGridPoint)) {

closestGridPoint.setSource(source_type);

closestGridPoint.setTarget(Inkscape::SNAPTARGET_GRID_INTERSECTION);

sp_list.push_back(closestGridPoint);

}

// search for the closest snapped intersection of guide lines

Inkscape::SnappedPoint closestGuidePoint;

if (getClosestIntersectionSL(sc.guide_lines, closestGuidePoint)) {

closestGuidePoint.setSource(source_type);

closestGuidePoint.setTarget(Inkscape::SNAPTARGET_GUIDE_INTERSECTION);

sp_list.push_back(closestGuidePoint);

}

// search for the closest snapped intersection of grid with guide lines

if (snapprefs.getSnapIntersectionGG()) {

Inkscape::SnappedPoint closestGridGuidePoint;

if (getClosestIntersectionSL(sc.grid_lines, sc.guide_lines, closestGridGuidePoint)) {

closestGridGuidePoint.setSource(source_type);

closestGridGuidePoint.setTarget(Inkscape::SNAPTARGET_GRID_GUIDE_INTERSECTION);

sp_list.push_back(closestGridGuidePoint);

}

}

}

// now let's see which snapped point gets a thumbs up

Inkscape::SnappedPoint bestSnappedPoint = Inkscape::SnappedPoint(p, Inkscape::SNAPSOURCE_UNDEFINED, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false);

// std::cout << "Finding the best snap..." << std::endl;

for (std::list<Inkscape::SnappedPoint>::const_iterator i = sp_list.begin(); i != sp_list.end(); i++) {

// first find out if this snapped point is within snapping range

// std::cout << "sp = " << from_2geom((*i).getPoint());

if ((*i).getSnapDistance() <= (*i).getTolerance()) {

// if it's the first point, or if it is closer than the best snapped point so far

if (i == sp_list.begin() || bestSnappedPoint.isOtherSnapBetter(*i, false)) {

// then prefer this point over the previous one

bestSnappedPoint = *i;

}

}

// std::cout << std::endl;

}

// Update the snap indicator, if requested

if (_snapindicator) {

if (bestSnappedPoint.getSnapped()) {

_desktop->snapindicator->set_new_snaptarget(bestSnappedPoint);

} else {

_desktop->snapindicator->remove_snaptarget();

}

}

// std::cout << "findBestSnap = " << bestSnappedPoint.getPoint() << " | dist = " << bestSnappedPoint.getSnapDistance() << std::endl;

return bestSnappedPoint;

}

void SnapManager::setup(SPDesktop const *desktop,

bool snapindicator,

SPItem const *item_to_ignore,

std::vector<std::pair<Geom::Point, int> > *unselected_nodes,

SPGuide *guide_to_ignore)

{

g_assert(desktop != NULL);

_item_to_ignore = item_to_ignore;

_items_to_ignore = NULL;

_desktop = desktop;

_snapindicator = snapindicator;

_unselected_nodes = unselected_nodes;

_guide_to_ignore = guide_to_ignore;

}

void SnapManager::setup(SPDesktop const *desktop,

bool snapindicator,

std::vector<SPItem const *> &items_to_ignore,

std::vector<std::pair<Geom::Point, int> > *unselected_nodes,

SPGuide *guide_to_ignore)

{

g_assert(desktop != NULL);

_item_to_ignore = NULL;

_items_to_ignore = &items_to_ignore;

_desktop = desktop;

_snapindicator = snapindicator;

_unselected_nodes = unselected_nodes;

_guide_to_ignore = guide_to_ignore;

}

SPDocument *SnapManager::getDocument() const

{

return _named_view->document;

}

Geom::Point SnapManager::_transformPoint(std::pair<Geom::Point, int> const &p,

Transformation const transformation_type,

Geom::Point const &transformation,

Geom::Point const &origin,

Geom::Dim2 const dim,

bool const uniform) const

{

/* Work out the transformed version of this point */

Geom::Point transformed;

switch (transformation_type) {

case TRANSLATION:

transformed = p.first + transformation;

break;

case SCALE:

transformed = (p.first - origin) * Geom::Scale(transformation[Geom::X], transformation[Geom::Y]) + origin;

break;

case STRETCH:

{

Geom::Scale s(1, 1);

if (uniform)

s[Geom::X] = s[Geom::Y] = transformation[dim];

else {

s[dim] = transformation[dim];

s[1 - dim] = 1;

}

transformed = ((p.first - origin) * s) + origin;

break;

}

case SKEW:

// Apply the skew factor

transformed[dim] = (p.first)[dim] + transformation[0] * ((p.first)[1 - dim] - origin[1 - dim]);

// While skewing, mirroring and scaling (by integer multiples) in the opposite direction is also allowed.

// Apply that scale factor here

transformed[1-dim] = (p.first - origin)[1 - dim] * transformation[1] + origin[1 - dim];

break;

default:

g_assert_not_reached();

}

return transformed;

}

void SnapManager::_displaySnapsource(Inkscape::SnapPreferences::PointType point_type, std::pair<Geom::Point, int> const &p) const {

Inkscape::Preferences *prefs = Inkscape::Preferences::get();

if (prefs->getBool("/options/snapclosestonly/value")) {

bool p_is_a_node = point_type & Inkscape::SnapPreferences::SNAPPOINT_NODE;

bool p_is_a_bbox = point_type & Inkscape::SnapPreferences::SNAPPOINT_BBOX;

if (snapprefs.getSnapEnabledGlobally() && ((p_is_a_node && snapprefs.getSnapModeNode()) || (p_is_a_bbox && snapprefs.getSnapModeBBox()))) {

_desktop->snapindicator->set_new_snapsource(p);

} else {

_desktop->snapindicator->remove_snapsource();

}

}

}